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  • August 19, 2019, 10:55:22 pm
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 1 
 on: Today at 10:44:00 pm 
Started by Newtosunn - Last post by Newtosunn
Hello everyone!  I?m new to this forum.  I recently acquired this cabinet.   From what I understand it had been sitting in a garage for 30 + years unused.  I cleaned it up the best I could.  Looks like the tolex was removed and replaced with white vinyl wrapping.  Grill cloth looks replaced as well.  Casters were removed and covered with the vinyl.  Dimensions are 36 x 24x 11.5.  Not sure if the speakers work. 

I have Fender Hot Rod Deluxe 40w which has an extension speaker jack.  I?ve read many different things about ohms/impedance and I?m hesitant to hook anything up.  I know very little about circuits and ohms.  Any suggestions for testing the speakers?  I don?t have electrical readers or circuit testers.  Also, are these normally played through a amp head?  Are the speakers wired in parallel?

Last question, would it be hard or worth putting tolex back on to restore to a more vintage look?  Just curious on the forums thoughts.  Thanks and I?m looking forward to playing this. 

 2 
 on: Today at 06:20:33 pm 
Started by FannieBon - Last post by FannieBon
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 3 
 on: Today at 12:28:19 pm 
Started by FannieBon - Last post by FannieBon
XEvil 4.0: NEW revolutional software complex for SEO/SMM
 

 
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including such of popular, like Google CAPTCHA's ReCaptcha v2, v3 (in XEvil 4.0 Ultra only!), Captcha.Com, SolveMedia, Bing-Captcha,
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2. Very High speed and precision: recognition speed 0.01 .. 0.02 second per image (but only 1 second in DEMO version!),
XEvil can bypass and solve wide types of captcha with high precision,
without depending of difficulty, distortion, noises, fonts, colors.
 
Exception is Google ReCaptcha-2: about 20-30 seconds per solution,
on ReCaptcha-2 need to click a lot of images with a special delay.
 
3. Very simple UI: just 3 main buttons to start recognition,
so it easy to use with a wide spectre programs of SEO, SMM, Analytics,
Mass Auto-Registering/Posting/Sending/Bruteforcing/CryptoCurrency Mining programs.
 
Interested? ;)
Just do Search in google "XEvil for Free" .
Free DEMO version is available!
 
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Website with Free DEMO version:
http://XEvil.net/
(Free DEMO version very restricted in functionality!)
 
Website with full version with XEvil 4.0 Ultra:
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 4 
 on: Today at 08:09:33 am 
Started by Isaac - Last post by Ryan Phelps
Well Issac, I'm at a similar point. I'll be 65 in September. I have 7 Sunn heads, 7 speaker cabinets and 1 combo (Stage Bass) and need to start letting this stuff go.  :-(

 5 
 on: Yesterday at 03:00:14 pm 
Started by madaradio - Last post by FannieBon
For some reason, I am having problems using the forum with Firefox.  I log in as per usual and nothing happens - it goes to the main forum page as if I had never logged in.

Dont have these problems with Opera...   

Any suggestions??

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 6 
 on: August 17, 2019, 09:17:52 am 
Started by Isaac - Last post by EdBass
Gotta happen sooner or later.

Regretfully that's spot on.  I'm at the "I still have room for what I've got, but I would have to trip over a SERIOUS deal in order to add to the collection" stage.

 7 
 on: August 16, 2019, 08:28:32 am 
Started by Isaac - Last post by Isaac
Gotta happen sooner or later.

 8 
 on: August 15, 2019, 10:29:01 am 
Started by Isaac - Last post by D.M.N.
Well look, if you guys ever want to offload some kit, I'm more than happy to give amps a loving home.  :wink:

 9 
 on: August 03, 2019, 01:17:00 pm 
Started by ducatidoc - Last post by EdBass
I don't think it would have been a problem for Sunn to scale up the 2000S to a 6 X 6550 or an 8 X 6550 and maintain the ultralinear Hafler/Laurent Dynaco circuit. As far as transformers, all that needed to be done was to commission a transformer builder to make them.
Interestingly enough, that almost had to be the case when the 1000 series amps were produced in 1968. While the 100 series Sunns were pretty much dead on the Dynaco circuit, including "Dynaco Super Fidelity" transformers, there WAS no Dynaco 4 X KT88/6550 amp, therefore no Dynaco Super Fidelity 4 X KT88/6550 transformers until 1976, 8 years after the Sunn 4 X 6550 amps were introduced.
In 1969 the SVT came out, and pretty quickly (and deservedly IMO) became the King, still is 50 years later.
Mr Sundholm sold in 1971, and I certainly can't speak for him however I'm sure if he were so inclined to make a 300, 400 watter using the Dynaco circuit he could have, and doubt that unavailability of larger ultralinear transformers would have presented a serious challenge.

As far as the <1% distortion, (as with the rated output) that's somewhere around "3" on a Sunn's volume knob. The reason that Sunns were renowned for being "loud" amps is because the were rated so low; in the actual MI world no one played them at "3". A 2000S is a solid 200+ watt amp in a live situation, one of mine that was retrofitted with a SDS Cap board benched in the 220-230 range at around 5% THD, peaks north of 280. 5% is a usable "clean" for live use, <1% is hi-fi world clean.
Bass Gear Magazine lab tested a Reeves C225 at 256 watts, 5% THD, they did it right, that's a solid rating. I A/B'ed a C225 next to a 2000S for literally dozens of hours during the development of the Reeves, the Reeves is more powerful - but not by much. Certainly not a 225 watt amp being A/B'ed with a 120/150 watt amp "more powerful".

As far as your theoretical question, well, you need to build one and let us know the answer.  :-D
One thing I am sure about is that no  amp company is going to build a 200lb amp, there is absolutely ZERO chance of ever selling them, and they are not about to expend any effort or $ even researching such a beast.

 10 
 on: August 02, 2019, 01:07:05 pm 
Started by ducatidoc - Last post by ducatidoc
I think I made the question too broad, whereas the thing that got me started on this train of thought was a Conrad interview I watched (don't remember which one), wherein he was talking about the late '60's amp scene and made reference to "everybody was going for bigger and louder". Solid state tech at the time wasn't reliable enough, so they were stuck with tubes (notwithstanding the SS rectifiers that were gradually being swapped into their design). I have always maintained that 120-150 watts was the max he could get at the time, with tubes, if he wanted to maintain the hi-fi standard, and this was related to the unavailability of larger ultralinear transformers.

So the 4 x 6550 amps were, for a time, the loudest available production amps, assuming you wanted to maintain <1% THD across the spectrum. I think it's fairly well known that Sunn was the only major amp mfg to use ultralinear OTs, and that's how they achieved that std.

So.... could we beat that today, with a tube power amp design, in less than a 200# chassis ? Let's suppose we want to base it around a 2000S-type circuit, and end up with a similar style head, albeit up to 120# heavier.  Assume your roadies are ex-NFL lineman.

And again, I don't want to try anything build-wise. It's strictly hypothetical.  A chance to think like a Sundholm.

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